<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.box1{
				border:5px solid red;
				width: 300px;
				height: 300px;
			}
			.box2{
				border:5px solid black;
				width: 100px;
				height: 150px;
				float: left;
			}
			.box3{
				border:5px solid blue;
				width: 150px;
				height: 150px;
				float: left;
				
			}
			.box4{
				border:5px solid green;
			}
		</style>
	</head>
	<body>
		<div class="box1">
			<div class="box2">22222</div>
			<div class="box3">33333</div>
		</div>
		<div class="box4">44444</div>
	</body>
</html>
